You've obviously no experience of industrial relations. A happy well informed workforce doesn't go on strike. The popular press idea of one militant getting the workforce to follow him like sheep is just plain ludicrous to anyone with direct experience of trades unions.
The poor build quality of BL has got to be down to unreasonable times allowed for tasks, etc, poor production engineering, and poor quality control. All of which done to save money in the short term.
A prime example was the paint on early SD1s, which simply fell off. And no wax injection or rust proofing. Some blame it on poor steel, but the steel came from the same mills as many other cars. It was just a poor process - nothing to do with the workforce, but they got the blame.
My '84 SD1 was painted in old fashioned cellulose, and all cavities wax filled. It's still sound despite never having been garaged.